Small cfg_base normalization change (#1582)
Small cfg_base normalization change (#1582)

* Update cfg_base.py

Sometimes smallest_nodes contains the same node twice. In those cases, without the newly added condition, the normalization will fail. 
Spotted this behavior in some ARM32 thumb files.

iamahuman/angr,angr/angr,iamahuman/angr,schieb/angr,iamahuman/angr,angr/angr,schieb/angr,angr/angr,schieb/angr